v1.12.0

• Added command \IterateBuffer for iterating over buffers and applying a
  macro to each line.

• Added command \BufferMdfivesum that calculates the MD5 sum of the current
  buffer.

• Added command \WriteBuffer that writes a buffer to file. This is the
  buffer equivalent of VerbatimWrite.

• Added new options for \InsertBuffer: wrapperenvname, wrapperenvopt,
  wrapperenvarg. Improved implementation of \InsertBuffer to eliminate
  temp macros.

• Optimized line breaking for very long lines (#28).